Electrical heater.



Patented Apr. 19, 1910.

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Jtforn J1 ROYAL terms, or ST. PAUL PARK, MINNESOTA.

ELECTRICAL HEATER.

Specification of Letters Patent.

Patented Apr. 19, 1910.

Application filed April 6, 1909. Serial No. 488,206.

Electrical Heaters, of which the following is a specification.

My invention relates to improvements in electrical heaters and more particularly to that class in which an electrical resistance conductor is employed for transforming the electrical energy into heat and to improved means for insulating said conductor and radiatin the heat therefrom.

In ad ition to providing the above features of construction, my invention includes an automatic regulator which is adapted to prevent an excessive amount of heat being produced in the radiator.

In the accompanying drawings forming part of this specification Fi re 1 is a side elevation of my invention; ig. 2 is an end elevation; Fig. 3 is a plan view, the 'cover of the radiator being removed; Fig. 4 is a vertical section of one of the radiator tubes a portion of the top of the radiator to which said tube is connected .being also shown in section; Fig. 5 is a cross section of one of the radiator tubes- Fig. 6 is a vertical sec tion of a portion of one of the radiator tubes, said section bein taken on the plane Z-Z, as indicated in 1g. 5; Fig. 7 is a diagrammatic view of a circuit illustrating one way in which the coils are connected in the radiator andthe automatic cutout included, and Fig. 8 is a plan of the automatic cutout a portion thereof being broken away to expose the interior construction to view.

s In the drawings A represents one form of an inclosing radiator frame with which my invention is adapted to be used said frame as illustrated bein composed of a fluid con- .tainin head 2 WhlCh is adapted to be supporte u on standardsfi at each end. These standar s may be secured to a sup ort or floor by'the screws -5 or other suitable fas- The head 2 has connected therewith a lurality of dependingtubes B each of whic is threaded to the head 2 and has at its lower end a threaded lug 6. r The head 2 is provided with a siiita le cap 7 secured thereon by means .of the screws 8. All of the parts of said inclosing radiator frame are oined together to form an air tight inclosure which is ada ted to be filled or nearly filled with a suitab e electrical nontening means.

.the Wall 13.

conducting liquid for the purposes which will be hereinafter described. Contained in each electrical tube B is a suitable mount 0' for the electrical conductor, which as illustrated, is in the form of a frame having four corner pieces 9 which are joined together by diagonal webs 10. The lower and upper ends 9 of the cores are larger than the intermediate portions and serve to hold the cores with the electrical resistance conductor wound thereon, out of contact withthe shell of the frame. The terminals or ends of the coils are brought up into the head of the radiator where they may be connected in series as illustrated in Fig. 7 or in any other manner as is customary and well known in the art to which this invention relates.

At one end of the chamber in the head is a transverse partition 13 forming a separate chamber 14 in which is located an electrical cutout 15'. The main inclosing chamber with which the radiating tubes are connected is filled or nearly filled with paraflin oil or other suitable liquid or material which is adapted to act as an insulator for the electrical resistance conductor and to transmit through intimate contact with said conductor. The cutoutlo is in the form of a shallow shell which is closed tightly by means of a cover 16. In this shell, is mounted a hollow connector 17 which is supported by means of the screws 18 passing through the outer wall and shell. This connector is in communication with the main chamber of the radiator over the radiating tubes by means of the pipe 19 which passes througi Rigidly supported upon the connector 17 is a curved spring tube 20 which also communicates with the main chamber through the connector 17 and pipe 19. The free end 21 of the curved tube is freely coupled by means of the link 22 with the free 'end of a swinging arm 23. This arm is pivotally mounted upon the screw 24 in the chamber of the cutout. The cutout is adapted to be included in one side of the circuit 25 which contains the coils 12. Said circuit passes through'the binding post 26, conductor 27, arm 23, contact screw 28, support 29 for said contact screw and binding post 30. The two binding posts 26 and 30 are suitably insulated from the shell of the cutout so that thecircuit is not in contact with the radiator. Normally the arm 23 makes contact with the contact screw 28 but when the insulating liquid in the radiator expands the pressure which it produces owing to the inclosing radiator frame being air-tight causes the curved arm 20 of the cutout to swing out and tend to straighten owing to the expansion of the liquid within when it rises in temperature. In'this manner, the switch arm 23 is thrown out of contact with the screw 28 and the circuit of the radiator automatically opened. To reduce corrosion and decomposition of the electrical contact parts of the cutout, the cutout ,whence itis radiated through the atmosphere, The expansion owin to the rise of temperature of said insulating liquid also causes the cutout to automatically open should the radiator reach a dangerously high degree of temperature thus preventing the hazard of the radiator frame bursting. By providing this safety means for cutting out the circuit in case of undue rise of temperature within, the heat conducting liquid is prevented from evaporating which would occur if the radiator was not hermetically sealed as described and the resistance wire whichgenerates the heat is thus prevented from oxidizing by contact with air.

In accordance with the patent statutes, 1'

have described the princi les of operation of my invention together with apparatus which I now consider to re resent the best embodiment thereof but I desire to have it understood that the construction shown is only illustrative and that the invention can be carried out by other meansand applied to uses other than those above set forth Within the scope of the following claims.

' Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A device of the'class set forth, comprising, in combination, anv inclosing radiator frame, a core within said frame, an electrical resistance conductor upon said core,

a combined electrical insulating and heat conducting liquid between said core and ame, and a circuit opener included with said conductor and associated with said liquid, said opener being provided with means for cutting out said conductor by the expansive force of said liquid due to its rise in temperature.

2. An electrical heater, comprising, in combination, an inclosing radiator frame, a core within said frame,- an electrical insulating liquid between said core and frame and an electrical resistance conductor wound upon said core, said liquid acting as a medlum in intimate contact with said conductor core and frame to transmit heat.

3. An electrical heater, comprising, in combination, a radiator frame having a hollow head and depending tubes from said head, means for supportmg said frame in upright position, an electrical insulating core in one of said tubes, an electrical resistance conductor upon said core, an electrical insulating liquid hermetically sealed within said frame and covering the conductor on said core to transmit heat from the conductor to said frame, and a circuit opener-connected with said conductor and having a switch and a curved tube con-. nected with said liquid and adapted to move and open said switch by the expansion of said liquid due to rise of temperature.

4. An electrical heater, comprisin in combination, an inclosing radiator rame havin a hollow head from which depend a plura ity of tubes, insulating cores erected in said tubes, an electrical resistance conductor wrapped upon said cores, a heat conductin electrical insulating substance. filling said radiator in intimate contact with said resistance conductor and the walls of. said tubes and an electrical cutout in circuit with said electrical resistance conductor controlled by the expansive force of said heat conducting electrical insulating material to opensaid circuit should the radiator reach a. dangerously high degree of temperature.

5. A device of the class set forth, comprising, in combination, an inclosing radiator frame, an insulating core-within said frame, an electrical resistance conductor upon-said core, a combined electrical insulatingand heat conducting liquid between said core and frame and a cutout in circuit with said conductor adapted to open said circuit when said radiator reaches an excessive degree of temperature.

In'testimony, whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

. ROYAL LARES.

Witnesses: r

H. L, FIsoHER, F. G. BRADBURY. 

